Science
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Ons Land
A hexagon-based data visualization of land use across the Netherlands, showing how the country's land is distributed bet…
Open Anatomy Project
A set of free, open 3D human anatomy atlases you can rotate and explore in the browser, built to give medical students e…
Open Exoplanet Catalogue
An open-source database of every confirmed exoplanet, with statistics, plots, and tools for comparing planets and their…
Open Infrastructure Map
A zoomable world map built from OpenStreetMap data showing power lines, substations, pipelines, telecom cables and other…
Open Knowledge Maps
A visual search interface that turns a research topic into a bubble map of related papers and concepts, helping you get…
Open Language Archives Community
A network of digital archives cataloguing language documentation and linguistic field data contributed by researchers ar…
Open Logic Project
A collaborative, open-source logic textbook that teachers can freely customize, covering propositional and first-order l…
Open Source Seeds Loosen Big Ag's Grip on Farmers
A feature on the open-source seed movement, where breeders license varieties for free sharing so farmers can save, trade…
Open Syllabus
A project that maps the college curriculum across tens of millions of syllabi, letting you explore which books and texts…
Open Syllabus Galaxy
An interactive map of the million most-assigned books and articles in college courses, laid out as a glowing galaxy wher…
Open Textbook Initiative
A curated list of free open textbooks in mathematics from the American Institute of Mathematics, covering topics from ca…
OpenPrescribing
A public data explorer for NHS England prescribing, charting trends in what GPs prescribe and how much it costs, built t…
OpenStax
A Rice University nonprofit publishing free, peer-reviewed, openly licensed textbooks for college and high-school subjec…
OpenStax
Free peer-reviewed college textbooks in math, science, social sciences and humanities, readable online and downloadable…
OpenTopoMap
A free topographic world map built from OpenStreetMap data, showing contour lines, hillshading, hiking paths and summit…
Opinionated Dress Color Simulation
An interactive simulation of the famous blue-and-black or white-and-gold dress, letting you change the lighting to see h…
Optical Toys
A collection of optical illusions and interactive optical toys by Toms Toys that play tricks on your eyes and show how e…
Optimum Sports Performance
A blog by Patrick Ward, PhD, covering sports science, strength and conditioning, physical therapy, and nutrition with re…
Orb.farm
A tranquil aquatic ecosystem simulator where you sculpt a glass orb, add algae and fish, and watch a tiny nutrient cycle…
ORBIS
Stanford's geospatial model of the Roman world that calculates the time and cost of travel between ancient cities by roa…
Orbit Simulator
A free browser-based gravity simulator that lets you build and watch star systems, orbits, and collisions play out in re…
Orbital Central
Home of the Orbital Viewer, which shows atomic orbitals in all their glory, along with shareware cribbage, a picture vie…
Orbital Focus
An amateur hobbyist site tracking the International Space Station, satellites, and human spaceflight news with a UK pers…
Orbital Objects Globe
A WebGL globe mapping the objects orbiting Earth, so you can spin the planet and see just how crowded low orbit has beco…
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